mean = the sum of the observed values / number of observations
= 23+12+15+25+10 / 5
=85/5
=17
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There are an infinite number of sets-of-4 that all have a mean of 12. Here are a few of them : 12, 12, 12, and 12 10, 11, 12, and 15 5, 10, 15, and 18 5, 7, 13, and 23 -12, 10, 20, and 30 1, 2, 3, and 42
mean(18, 23, 39, 10, 22, 17, 16, 15) = (18 + 23 + 39 + 10 + 22 + 17 + 16 + 15) ÷ 8 = 160 ÷ 8 = 20
7 and 10/15 + 2 and 12/15 = 9 and 22/15 = 10 and 7/15
The mean is 23.
23